Trajectories of Illness Perceptions 1 Trajectories of Illness Perceptions in Persons with Chronic Illness: An Explorative Longitudinal Study Tore Bonsaksen Department of Occupational Therapy, Prosthetics and Orthotics, Faculty of Health Sciences, Oslo and Akershus University College of Applied Sciences, Oslo Anners Lerdal Research Department, Lovisenberg Diakonale Hospital, Oslo; and Department of Nursing Science, Institute of Health and Society, University of Oslo, Oslo May Solveig Fagermoen Department of Gastroenterology, Division of Medicine, Oslo University Hospital, Oslo; and Department of Nursing Science, Institute of Health and Society, University of Oslo, Oslo Corresponding author: Tore Bonsaksen, Oslo and Akershus University College of Applied Sciences, Faculty of Health Sciences, Department of Occupational Therapy, Prosthetics and Orthotics, Oslo. Telephone +47 90 08 60 15. E-mail tore.bonsaksen@hioa.no